when i got my vx in my tornado, the factory setting were to lean, and it ran hot and very fast and hard to start . after i learned more about this thing i richened it way up and i could always start it and it would run very cool. could touch it after running. i ran it for a long time at the factory settings not knowing anthing was wrong and i now have an OS 18 that im breaking in. i would say richen that hsp 3/4 turn and buy an OS a3 plug.$0.02